[PM-32131] Add UseMyItems organization ability (#7014)

Purpose: UseMyItems is a new organization ability / plan flag
which is automatically enabled where UsePolicies is enabled,
but can be selectively disabled to disable My Items creation
when the Organization Data Ownership policy is turned on.

- new organization table column with all sprocs and views updated
- data migration to enable the feature for all organizations that already use policies (replicating existing behaviour)
- data and api models updated
- added to organization license file so it can be preserved in self-hosted instances
- note that we don't have a plan feature defined for this yet, so it is set based on UsePolicies to match the migration logic. Billing Team have a ticket to add this

util/PostgresMigrations/Migrations/20260224100000_AddUseMyItemsToOrganization.cs

@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Bit.PostgresMigrations.Migrations;
+
+/// <inheritdoc />
+public partial class AddUseMyItemsToOrganization : Migration
+{
+    /// <inheritdoc />
+    protected override void Up(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.AddColumn<bool>(
+            name: "UseMyItems",
+            table: "Organization",
+            type: "boolean",
+            nullable: false,
+            defaultValue: false);
+    }
+
+    /// <inheritdoc />
+    protected override void Down(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.DropColumn(
+            name: "UseMyItems",
+            table: "Organization");
+    }
+}

util/PostgresMigrations/Migrations/20260224100001_UseMyItemsDataMigration.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Bit.PostgresMigrations.Migrations;
+
+/// <inheritdoc />
+public partial class UseMyItemsDataMigration : Migration
+{
+    /// <inheritdoc />
+    protected override void Up(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.Sql(@"
+                UPDATE ""Organization""
+                SET ""UseMyItems"" = true
+                WHERE ""UsePolicies"" = true;
+            ");
+    }
+
+    /// <inheritdoc />
+    protected override void Down(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.Sql(@"
+                UPDATE ""Organization""
+                SET ""UseMyItems"" = false
+                WHERE ""UsePolicies"" = true;
+            ");
+    }
+}

util/PostgresMigrations/Migrations/DatabaseContextModelSnapshot.cs

@@ -243,6 +243,9 @@ namespace Bit.PostgresMigrations.Migrations
                     b.Property<bool>("UseKeyConnector")
                         .HasColumnType("boolean");
 
+                    b.Property<bool>("UseMyItems")
+                        .HasColumnType("boolean");
+
                     b.Property<bool>("UseOrganizationDomains")
                         .HasColumnType("boolean");